AD6645 Summary of contents

... Communications instrumentation Radars, infrared imaging Instrumentation GENERAL DESCRIPTION The AD6645 is a high speed, high performance, monolithic 14-bit analog-to-digital converter (ADC). All necessary functions, including track-and-hold (T/H) and reference, are included on the chip to provide a complete conversion solution. The AD6645 provides CMOS-compatible digital outputs the fourth ...

... AD6645 Spurious-Free Dynamic Range (SFDR) The ratio of the rms signal amplitude to the rms value of the peak spurious spectral component. The peak spurious component may or may not be a harmonic. May be reported in dBc (that is, degrades as signal level is lowered) or dBFS (always related back to converter full scale). ...

... RF transformer. The back-to-back Schottky diodes across the transformer secondary limit excessive amplitude swings from the clock into the AD6645 to approximately 0.8 V p-p differential. This helps to prevent the large voltage swings of the clock from feeding through to other portions of the AD6645 and limits the noise presented to the encode inputs ...

... Place the series resistors as close AIN to the AD6645 as possible to limit the amount of current that can flow into the output stage. These switching currents are confined between ground and DV because they can add appreciably to the dynamic switching currents of the AD6645 ...

... The pinout of the AD6645 facilitates ease of use in the implementation of high frequency, high resolution design practices. All of the digital outputs are segregated to two sides of the chip, with the inputs on the opposite side for isolation purposes ...